Last Enchantment By Mary Stewart. Number three in Stewart's Arthurian legend series, finds Arthur as king. Unchallenged on the battlefield, he melds the country together in a time of promise. But sinister powers plot to destroy Camelot, when the witch-queen Morgause--Arthur's own half sister--ensnares him in an incestous liaison, a fatal web of love, betrayal and bloody vengence is woven. PB. 513 pgs.